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基于刚体弹簧法的钢筋混凝土结构破坏过程模拟方法 被引量:4
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作者 赵超 钟新谷 +2 位作者 刘波 张天予 石卫华 《矿业科学学报》 2018年第2期129-138,共10页
针对现有连续数值方法难以准确描述裂缝特征以及非连续数值方法不能反映结构刚度的问题,给出了一种基于刚体弹簧模型分析钢筋混凝土结构破坏过程的数值方法。采用刚体弹簧模型模拟混凝土,并基于Voronoi图生成其随机网格;采用杆单元模拟... 针对现有连续数值方法难以准确描述裂缝特征以及非连续数值方法不能反映结构刚度的问题,给出了一种基于刚体弹簧模型分析钢筋混凝土结构破坏过程的数值方法。采用刚体弹簧模型模拟混凝土,并基于Voronoi图生成其随机网格;采用杆单元模拟钢筋,并通过设置在单元节点上的黏结滑移单元与混凝土连接;通过单轴应力-应变曲线定义混凝土界面弹簧刚度,并采用Mohr-Coulomb强度准则判断混凝土的剪切破坏行为;基于FORTRAN语言编制了相应的计算程序,并将其应用于典型Z形构件和钢筋混凝土简支梁的破坏过程模拟。数值计算结果与试验结果的对比分析表明:所给方法能够较为准确地模拟结构的开裂行为,能够反映裂缝的位置、形态等特征,对于结构极限承载力和开裂后刚度的预测与试验结果基本吻合,是模拟钢筋混凝土结构破坏过程的一种可行且有效的方法。 展开更多
关键词 钢筋混凝土 破坏过程模拟 刚体弹簧法 裂缝扩展 材料非线性
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土质边坡渐进破坏过程的近似模拟 被引量:7
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作者 张坤勇 李广山 +1 位作者 杜伟 Habeeb Muhammad Zakari 《天津大学学报(自然科学与工程技术版)》 EI CSCD 北大核心 2019年第A01期99-105,共7页
用有限元强度折减法对边坡进行计算,分析滑动面上典型位置单元应力状态变化规律,建立单元应力状态和边坡整体稳定性之间关系,提出单元失稳判据.将判据的有限元语句程序化,对天然边坡进行有限元强度折减计算,应用所提判据和程序对边坡渐... 用有限元强度折减法对边坡进行计算,分析滑动面上典型位置单元应力状态变化规律,建立单元应力状态和边坡整体稳定性之间关系,提出单元失稳判据.将判据的有限元语句程序化,对天然边坡进行有限元强度折减计算,应用所提判据和程序对边坡渐进破坏过程进行有限元数值模拟,采用不同失稳判据和极限平衡法计算结果进行比较,验证了本文单元判据的合理性,本文判据能解释和模拟边坡的渐进破坏过程.将本文方法与位移突变判据结合使用,既能描述边坡渐进破坏,又便于工程中对边坡、基坑工程的安全性进行实时监测与反馈. 展开更多
关键词 渐进破坏 边坡失稳判据 破坏过程模拟 有限元强度折减法
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Mechanical response features and failure process of soft surrounding rock around deeply buried three-centered arch tunnel 被引量:1
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作者 赵瑜 张志刚 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第10期4064-4073,共10页
Due to the extreme complexity of mechanical response of soft surrounding rock(SR) around a tunnel under high geostatic stress conditions, the integration of physical and numerical modeling techniques was adopted. Base... Due to the extreme complexity of mechanical response of soft surrounding rock(SR) around a tunnel under high geostatic stress conditions, the integration of physical and numerical modeling techniques was adopted. Based on the similarity theory, new composite-similar material was developed, which showed good agreement with the similarity relation and successfully simulated physico-mechanical properties(PMP) of deep buried soft rock. And the 800 mm×800 mm×200 mm physical model(PM) was conducted, in which the endoscopic camera technique was adopted to track the entire process of failure of the model all the time. The experimental results indicate that the deformation of SR around a underground cavern possessed the characteristics of development by stages and in delay, and the initial damage of SR could induce rapid failure in the later stage, and the whole process could be divided into three stages, including the localized extension of crack(the horizontal load(HL) was in the range of 130 k N to 170 k N, the vertical load(VL) was in the range of 119 k N to 153.8 k N), rapid crack coalescence(the HL was in the range of 170 k N to 210 k N, the VL was in the range of 153.8 k N to 182.5 k N) and residual strength(the HL was greater than 210 k N, the VL was greater than 182.5 k N). Under the high stress conditions, the phenomenon of deformation localization in the SR became serious and different space positions show different deformation characteristics. In order to further explore the deformation localization and progressive failure phenomenon of soft SR around the deeply buried tunnel, applying the analysis software of FLAC3 D three-dimensional explicit finite-difference method, based on the composite strain-softening model of Mohr-Coulomb shear failure and tensile failure, the calculation method of large deformation was adopted. Then, the comparative analysis between the PM experiment and numerical simulation of the three centered arch tunnels was implemented and the relationship of deformation localization and progressive failure of SR around a tunnel under high stress conditions was discussed. 展开更多
关键词 deeply buried tunnel physical model(PM) surrounding rock(SR) failure process
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